i'm ken bastida. >> i'm dana king. tonight we hear from those bay area fifth graders, girls who tell us they are being bullied, even physically threatened at school, and that teachers aren't doing anything about it. watch what allen martin found when he went to check out the school. >> reporter: the school sign proclaims in bold letters, be safe, responsible, respectful. but cooper elementary school in vallejo is anything but, according to these two fifth graders. >> they punch us in the stomach. they slap us. >> reporter: samantha and autumn say they're constantly bullied in school by two brothers. samantha's parents say they knew there was a problem. >> my daughter coming home crying, telling me she was being called names, tramp, whore, slut. >> reporter: but the bullying got much worse. >> he said, i know where you live. i was like, how? i looked at his hand and could see a pocket knife. >> reporter: basically it got to the point where a child pulled a knife. >> a child pulled a nice on our daughter. >> reporter: sa